Thanks to all concerned for the new cal files.
In a desperate attempt to undermine your efforts I did some new traces using the new cal files.
Green and mustard are my two RS meters old and new using the new cal file for old meters. I have a 3dB calibration difference between the two meters on pink noise but they track well on the response curves.
The Galaxy 140 (C-unchecked) consistently reads lower output at about -32dB on SPL calibration. It shows falling output with falling frequency compared with the RS meters. 10dB discrepancy by 11Hz.
Deliberately checking C-weighting makes it droop even further with falling frequency.
I double checked that I reloaded the correct cal files after clearing each cal file. I checked on the graph that the correct cal curve was shown as well as the name appearing in the box under "Settings".
I carefully checked I had C weighting cleared (or checked) as appropriate for each meter and matching cal file.
I tried fast and slow on the Galaxy and carefully "calibrated SPL meter" to 75dB(C) in all cases.
All 3 meters were orientated at right angles to the IB and fitted to the tripod at the listening position without moving the tripod.
Any useful thoughts please?
